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|Title:||Pollen formation and fruit set in some cultivars of Heliconia psittacorum|
|Authors:||Lee, Y.H. |
|Citation:||Lee, Y.H.,Ng, N.Y.,Goh, C.J. (1994-12). Pollen formation and fruit set in some cultivars of Heliconia psittacorum. Scientia Horticulturae 60 (1-2) : 167-172. ScholarBank@NUS Repository.|
|Abstract:||Six cultivars of Heliconia psittacorum were selected for studies on their natural fruitbearing ability, pollen formation and pollination under the tropical climatic conditions of Singapore. Three of them, namely 'Tay', 'Andromeda' and 'Lady Di', were partially fertile with a very low rate of fruit set, ranging from 2.8% to 4.7%. They were found to be diploid with 2n = 24 chromosomes. The process of pollen formation (microsporogenesis) was normal, and pollen grains were all uniform in size and appeared normal. The poor fruit set of these three cultivars was attributed to poor pollen germination on stigmas rather than poor pollination or self-incompatibility. The other three cultivars, namely 'Petra', 'Sassy' and 'Iris', were completely sterile. Their pollen grains were of variable sizes and appeared to be abnormally fragmented. Over 80% of the pollen grains aborted 1-2 days before pollination. These abnormal features were consistent with irregular distribution of chromosomes during meiosis in microsporocytes. All three cultivars were confirmed to be triploid (2n = 3x = 36). © 1994.|
|Source Title:||Scientia Horticulturae|
|Appears in Collections:||Staff Publications|
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